ABSTRACT
Carbon nanotubes (CNT) are well-ordered, high aspect ratio allotropes of carbon. The two main variants, namely single-walled carbon nanotubes (SWNT) and multi-walled carbon nanotubes (MWNT) both possess the characteristics of high tensile strength, ultra-light weight, and excellent chemical and thermal stability. They also possess the semi- and metallic-conductive properties. This startling array of features has led to many proposed applications in the biomedical field. However, it is only recently that information on toxicity and biocompatibility has become available. Herein is presented a review on the toxicity and biocompatibility of carbon nanotubes.
Subject(s)
Animals , Humans , Biocompatible Materials , Toxicity , Materials Testing , Nanotubes, Carbon , Toxicity , Toxicity TestsABSTRACT
Objective To study the oxidative damage on testis of male rats induced by micro-nano-scale SiO2. Methods Male Wistar rats were exposed to nanometer SiO2(20-40 nm) and micro-meter SiO2(1-10 ?m)by intratracheal injection once two days. The rats were killed after 5 weeks of exposure. Some indicators related to the oxidative damage in the serum and the testis were determined. Results The activity of GSH-Px and SOD in the high dose groups decreased significantly and the MDA levels increased compared to the control group;The MDA levels of nano-silicon dioxide high dose group increased in the serum. Conclusion Nano-silicon dioxide may cause lipid peroxidation in the testis with a tendency of higher toxicity than that of micro-SiO2 at the same exposed level,the detail mechanism needs further discussion.
ABSTRACT
Objective To study the anti-neoplastic effect of Xuezhikang (Regulate blood-fat) Capsule in vitro and its influence on the chemotherapeutic drug 5 Fluorouracil (5-Fu).Methods Using MTT method to measure the inhibition rate of Xuezhikang Capsule used simply,5-Fu used simply and Xuezhikang Capsule with 5-Fu together on HepG2,MCF-7 and HL-60 cells.Results The inhibitory action of Xuezhikang Capsule(2.56,0.64,0.16,0.04,0.01 mg/ml) on HepG2,MCF-7 and HL-60 cells was dose-dependent and the IC50 was 14.057,19.859 and 27.771mg/ml respectively.The inhibition ratio of five different doses of Xuezhikang Capsule(0.64,0.16,0.04,0.01,0.0025 mg/ml) with 5-Fu (0.24mg/ml) together all remarkably higher than that of 5-Fu used simply.Conclusion Xuezhikang Capsule has a significant anti-cancer effect in vitro and can enhance remarkably the anti-neoplastic effect of 5-Fu.
ABSTRACT
The influence of anisodamine on the cerebral blood flow in the uncompletely ischemic brains was studied with radioactive biomicrosphere assay. After the bilateral carotid arteries were occluded the cerebral blood flow drawmatically decreased and middle part of the hemisphere had the most severe reduction. Anisodamine 10mg ? kg-1 iv selectively increased the cerebral blood flow in this area and 20mg ? kg-1 increased that in the whole hemisphere. When it was used in the dose of 40mg ? kg-, the increasing effect on the cerebral blood flow became weaker. While the cerebral blood flow decreased, the myocardial blood flow increased significantly after bilateral carotid artery occlusion. Anisodamine 20mg ? kg-1 iv made it further increase and 40mg ? kg-1 iv made it decrease. The cardiac index was not influenced by bilateral carotid artery occlusion and anisodamine 10~20mg ? kg-1 iv, but was significanntly increased by anisodamine 40mg ? kg-1 iv. These results suggested that anisodamine may be used in the treatment of ischemic cerebral diseases and should be used in different doses according to different purposes.